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Browsing by Subject "Laser beam"

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Demonstrating optical aberrations in the laboratory

Author: Naidoo, Darryl ; Mafusire, C ; Forbes, A Date: Jul 2009 An optical aberration is a distortion of an image as compared to the object due to defects in an optical system Read more
High power infrared super-Gaussian beams: generation, propagation and application

Author: Du Preez, NC ; Forbes, A ; Botha, LR Date: Sep 2009 In this paper researchers present the design of a CO2 laser resonator that produces as the stable transverse mode a super–Gaussian laser beam. The resonator makes use of an intra–cavity diffractive mirror and a flat output coupler, generating ... Read more
Modeling laser brightness from cross porro prism resonators

Author: Forbes, A ; Burger, L ; Litvin, IA Date: Jul 2006 Laser brightness is a parameter often used to compare high power laser beam delivery from various sources, and incorporates both the power contained in the particular mode, as well as the propagation of that mode through the beam quality ... Read more
Paint stripping with high power flattened Gaussian beams

Author: Forbes, A ; Du Preez, NC ; Belyi, VN ; Botha, LR Date: Aug 2009 In this paper the researchers present results on improved paint stripping performance with an intra-cavity generated Flattened Gaussian Beam (FGB). A resonator with suitable diffractive optical elements was designed in order to produce a ... Read more
Quality factor of aberrated gaussian laser beams

Author: Mafusire, C Date: Sep 2010 A model is used to calculate the beam quality factor of a laser beam from Zernike coefficients. It is tested by programming aberration coefficients on a laser beam and measuring the beam quality using a Shack-Hartmann wavefront sensor. The ... Read more
Spinning pipe gas lens revisited

Author: Mafusire, C ; Forbes, A ; Snedden, Glen C ; Michaelis, MM Date: 2008 The graded index (GRIN-like) medium generated by gas inside a heated steel pipe when rotated about its longitudinal axis has the ability to focus a laser beam. While the effective focal length of such a system has previously been studied, ... Read more
Superpositions of higher-order bessel beams and nondiffracting speckle fields

Author: Dudley, Angela L ; Vasilyeu, R ; Forbes, A ; Khilo, N ; Ropot, P ; Belyi, V ; Kazak, N Date: Aug 2009 This paper presents a mechanism for the generation of the superposition of higher-order Bessel beams, which implements a ring slit aperture and spatial light modulator (SLM). The experimental technique is also adapted to generate nondiffracting ... Read more

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Browsing by Subject "Laser beam"

Browsing by Subject "Laser beam"

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